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a in (-oo:+oo)
a+(3/7)*a+7 = 159/7 // - 159/7
a+(3/7)*a-(159/7)+7 = 0
a+(3/7)*a-159/7+7 = 0
10/7*a-110/7 = 0 // + 110/7
10/7*a = 110/7 // : 10/7
a = 110/7/10/7
a = 11
a = 11
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